is Midi Input Device Available - Java javax.sound.midi

Java examples for javax.sound.midi:MidiDevice

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Description

is Midi Input Device Available

Demo Code

/* Copyright (C) 2006 Christian Schneider
 * //  w w  w .j  a v  a 2 s .  c  o  m
 * This file is part of Nomad.
 * 
 * Nomad is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * Nomad is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Nomad; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
//package com.java2s;
import java.util.Collection;

import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;

public class Main {
    public static boolean isInputDeviceAvailable(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        return isInputDeviceAvailable(getMidiDevice(deviceInfo));
    }

    public static boolean isInputDeviceAvailable(MidiDevice device) {
        return hasAvailableTransmitters(device);
    }

    public static MidiDevice getMidiDevice(MidiDevice.Info deviceInfo)
            throws MidiUnavailableException {
        try {
            return MidiSystem.getMidiDevice(deviceInfo);
        } catch (IllegalArgumentException e) {
            // the device does not exist anymore - 
            // this seems to be a bug because MidiUnavailableException should
            // be thrown instead
            MidiUnavailableException m = new MidiUnavailableException();
            m.initCause(e);
            throw m;
        }
    }

    public static boolean hasAvailableTransmitters(MidiDevice device) {
        return probe(device.getMaxTransmitters());
    }

    private static boolean probe(Collection<?> receiverTransmitterList) {
        return !receiverTransmitterList.isEmpty();
    }

    private static boolean probe(int receivertransmitter) {
        return receivertransmitter == -1 || receivertransmitter > 0;
    }
}

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